up holds the president's health care reform law. >> few could have imagined the deciding vote was cast by the chief justice himself. conservatives stunned. liberals perplexed, but thrilled. forging ahead, the roberts court takes on same sex marriage. number nine, yahoo! ceo marissa meyer, at 37, head of a major tech company, a ceo in a male-dominated field, pregnant. it's the baby part that became problematic, shall we say, when meyer decided to take just a couple of weeks for martin leave. the mommy blogosphere went nuts. what message was she sending by not staying home with her baby. >> number eight, south korean rapper, psy. ♪ >> say what you want, his lasso inspired dance style first discovered on youtube, had everyone going gangnam. and we mean everyone. >> the last one and then the -- >> he was riding high in 2012, star performer in the most watched youtube video of all time. ♪ >> number seven, republican presidential candidate mitt romney. >> this election is over, but our principles endure. >> romney ran on his impressive business credentials, but it was his multip